/* D3DES (V5.09) -  
 *  
 * A portable, public domain, version of the Data Encryption Standard.  
 *  
 * Written with Symantec's THINK (Lightspeed) C by Richard Outerbridge.  
 * Thanks to: Dan Hoey for his excellent Initial and Inverse permutation  
 * code;  Jim Gillogly & Phil Karn for the DES key schedule code; Dennis  
 * Ferguson, Eric Young and Dana How for comparing notes; and Ray Lau,  
 * for humouring me on.  
 *  
 * Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge.  
 * (GEnie : OUTER; CIS : [71755,204]) Graven Imagery, 1992.  
 */   
#include "des.h"

static void scrunch(unsigned char *, unsigned long *);   
static void unscrun(unsigned long *, unsigned char *);   
static void desfunc(unsigned long *, unsigned long *);   
static void cookey(unsigned long *);   
   
static unsigned long KnL[32] = { 0L };   
static unsigned long KnR[32] = { 0L };   
static unsigned long Kn3[32] = { 0L };   
static unsigned char Df_Key[24] = {   
    0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,   
    0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,   
    0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67 };   
   
static unsigned short bytebit[8]    = {   
    0200, 0100, 040, 020, 010, 04, 02, 01 };   
   
static unsigned long bigbyte[24] = {   
    0x800000L,  0x400000L,  0x200000L,  0x100000L,   
    0x80000L,   0x40000L,   0x20000L,   0x10000L,   
    0x8000L,    0x4000L,    0x2000L,    0x1000L,   
    0x800L,     0x400L,     0x200L,     0x100L,   
    0x80L,      0x40L,      0x20L,      0x10L,   
    0x8L,       0x4L,       0x2L,       0x1L    };   
   
/* Use the key schedule specified in the Standard (ANSI X3.92-1981). */   
   
static unsigned char pc1[56] = {   
    56, 48, 40, 32, 24, 16,  8,  0, 57, 49, 41, 33, 25, 17,   
     9,  1, 58, 50, 42, 34, 26, 18, 10,  2, 59, 51, 43, 35,   
    62, 54, 46, 38, 30, 22, 14,  6, 61, 53, 45, 37, 29, 21,   
    13,  5, 60, 52, 44, 36, 28, 20, 12,  4, 27, 19, 11,  3 };   
   
static unsigned char totrot[16] = {   
    1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28 };   
   
static unsigned char pc2[48] = {   
    13, 16, 10, 23,  0,  4,  2, 27, 14,  5, 20,  9,   
    22, 18, 11,  3, 25,  7, 15,  6, 26, 19, 12,  1,   
    40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,   
    43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 };   
   
void deskey(key, edf)   /* Thanks to James Gillogly & Phil Karn! */   
unsigned char *key;   
short edf;   
{   
    register int i, j, l, m, n;   
    unsigned char pc1m[56], pcr[56];   
    unsigned long kn[32];   
   
    for ( j = 0; j < 56; j++ ) {   
        l = pc1[j];   
        m = l & 07;   
        pc1m[j] = (key[l >> 3] & bytebit[m]) ? 1 : 0;   
        }   
    for( i = 0; i < 16; i++ ) {   
        if( edf == DE1 ) m = (15 - i) << 1;   
        else m = i << 1;   
        n = m + 1;   
        kn[m] = kn[n] = 0L;   
        for( j = 0; j < 28; j++ ) {   
            l = j + totrot[i];   
            if( l < 28 ) pcr[j] = pc1m[l];   
            else pcr[j] = pc1m[l - 28];   
            }   
        for( j = 28; j < 56; j++ ) {   
            l = j + totrot[i];   
            if( l < 56 ) pcr[j] = pc1m[l];   
            else pcr[j] = pc1m[l - 28];   
            }   
        for( j = 0; j < 24; j++ ) {   
            if( pcr[pc2[j]] ) kn[m] |= bigbyte[j];   
            if( pcr[pc2[j+24]] ) kn[n] |= bigbyte[j];   
            }   
        }   
    cookey(kn);   
    return;   
    }   
   
static void cookey(raw1)   
register unsigned long *raw1;   
{   
    register unsigned long *cook, *raw0;   
    unsigned long dough[32];   
    register int i;   
   
    cook = dough;   
    for( i = 0; i < 16; i++, raw1++ ) {   
        raw0 = raw1++;   
        *cook    = (*raw0 & 0x00fc0000L) << 6;   
        *cook   |= (*raw0 & 0x00000fc0L) << 10;   
        *cook   |= (*raw1 & 0x00fc0000L) >> 10;   
        *cook++ |= (*raw1 & 0x00000fc0L) >> 6;   
        *cook    = (*raw0 & 0x0003f000L) << 12;   
        *cook   |= (*raw0 & 0x0000003fL) << 16;   
        *cook   |= (*raw1 & 0x0003f000L) >> 4;   
        *cook++ |= (*raw1 & 0x0000003fL);   
        }   
    usekey(dough);   
    return;   
    }   
   
void cpkey(into)   
register unsigned long *into;   
{   
    register unsigned long *from, *endp;   
   
    from = KnL, endp = &KnL[32];   
    while( from < endp ) *into++ = *from++;   
    return;   
    }   
   
void usekey(from)   
register unsigned long *from;   
{   
    register unsigned long *to, *endp;   
   
    to = KnL, endp = &KnL[32];   
    while( to < endp ) *to++ = *from++;   
    return;   
    }   
   
void des(inblock, outblock)   
unsigned char *inblock, *outblock;   
{   
    unsigned long work[2];   
   
    scrunch(inblock, work);   
    desfunc(work, KnL);   
    unscrun(work, outblock);   
    return;   
    }   
   
static void scrunch(outof, into)   
register unsigned char *outof;   
register unsigned long *into;   
{   
    *into    = (*outof++ & 0xffL) << 24;   
    *into   |= (*outof++ & 0xffL) << 16;   
    *into   |= (*outof++ & 0xffL) << 8;   
    *into++ |= (*outof++ & 0xffL);   
    *into    = (*outof++ & 0xffL) << 24;   
    *into   |= (*outof++ & 0xffL) << 16;   
    *into   |= (*outof++ & 0xffL) << 8;   
    *into   |= (*outof   & 0xffL);   
    return;   
    }   
   
static void unscrun(outof, into)   
register unsigned long *outof;   
register unsigned char *into;   
{   
    *into++ = (*outof >> 24) & 0xffL;   
    *into++ = (*outof >> 16) & 0xffL;   
    *into++ = (*outof >>  8) & 0xffL;   
    *into++ =  *outof++  & 0xffL;   
    *into++ = (*outof >> 24) & 0xffL;   
    *into++ = (*outof >> 16) & 0xffL;   
    *into++ = (*outof >>  8) & 0xffL;   
    *into   =  *outof    & 0xffL;   
    return;   
    }   
   
static unsigned long SP1[64] = {   
    0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L,   
    0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L,   
    0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L,   
    0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L,   
    0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L,   
    0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L,   
    0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L,   
    0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L,   
    0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L,   
    0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L,   
    0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L,   
    0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L,   
    0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L,   
    0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L,   
    0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L,   
    0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L };   
   
static unsigned long SP2[64] = {   
    0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L,   
    0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L,   
    0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L,   
    0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L,   
    0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L,   
    0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L,   
    0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L,   
    0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L,   
    0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L,   
    0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L,   
    0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L,   
    0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L,   
    0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L,   
    0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L,   
    0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L,   
    0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L };   
   
static unsigned long SP3[64] = {   
    0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L,   
    0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L,   
    0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L,   
    0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L,   
    0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L,   
    0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L,   
    0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L,   
    0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L,   
    0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L,   
    0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L,   
    0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L,   
    0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L,   
    0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L,   
    0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L,   
    0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L,   
    0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L };   
   
static unsigned long SP4[64] = {   
    0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,   
    0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L,   
    0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L,   
    0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L,   
    0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L,   
    0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L,   
    0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L,   
    0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L,   
    0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L,   
    0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L,   
    0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L,   
    0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L,   
    0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L,   
    0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L,   
    0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L,   
    0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L };   
   
static unsigned long SP5[64] = {   
    0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L,   
    0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L,   
    0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L,   
    0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L,   
    0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L,   
    0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L,   
    0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L,   
    0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L,   
    0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L,   
    0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L,   
    0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L,   
    0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L,   
    0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L,   
    0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L,   
    0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L,   
    0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L };   
   
static unsigned long SP6[64] = {   
    0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L,   
    0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L,   
    0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L,   
    0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L,   
    0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L,   
    0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L,   
    0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L,   
    0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L,   
    0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L,   
    0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L,   
    0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L,   
    0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L,   
    0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L,   
    0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L,   
    0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L,   
    0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L };   
   
static unsigned long SP7[64] = {   
    0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L,   
    0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L,   
    0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L,   
    0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L,   
    0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L,   
    0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L,   
    0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L,   
    0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L,   
    0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L,   
    0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L,   
    0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L,   
    0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L,   
    0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L,   
    0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L,   
    0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L,   
    0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L };   
   
static unsigned long SP8[64] = {   
    0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L,   
    0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L,   
    0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L,   
    0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L,   
    0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L,   
    0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L,   
    0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L,   
    0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L,   
    0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L,   
    0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L,   
    0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L,   
    0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L,   
    0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L,   
    0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L,   
    0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L,   
    0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L };   
   
static void desfunc(block, keys)   
register unsigned long *block, *keys;   
{   
    register unsigned long fval, work, right, leftt;   
    register int round;   
   
    leftt = block[0];   
    right = block[1];   
    work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;   
    right ^= work;   
    leftt ^= (work << 4);   
    work = ((leftt >> 16) ^ right) & 0x0000ffffL;   
    right ^= work;   
    leftt ^= (work << 16);   
    work = ((right >> 2) ^ leftt) & 0x33333333L;   
    leftt ^= work;   
    right ^= (work << 2);   
    work = ((right >> 8) ^ leftt) & 0x00ff00ffL;   
    leftt ^= work;   
    right ^= (work << 8);   
    right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;   
    work = (leftt ^ right) & 0xaaaaaaaaL;   
    leftt ^= work;   
    right ^= work;   
    leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;   
   
    for( round = 0; round < 8; round++ ) {   
        work  = (right << 28) | (right >> 4);   
        work ^= *keys++;   
        fval  = SP7[ work        & 0x3fL];   
        fval |= SP5[(work >>  8) & 0x3fL];   
        fval |= SP3[(work >> 16) & 0x3fL];   
        fval |= SP1[(work >> 24) & 0x3fL];   
        work  = right ^ *keys++;   
        fval |= SP8[ work        & 0x3fL];   
        fval |= SP6[(work >>  8) & 0x3fL];   
        fval |= SP4[(work >> 16) & 0x3fL];   
        fval |= SP2[(work >> 24) & 0x3fL];   
        leftt ^= fval;   
        work  = (leftt << 28) | (leftt >> 4);   
        work ^= *keys++;   
        fval  = SP7[ work        & 0x3fL];   
        fval |= SP5[(work >>  8) & 0x3fL];   
        fval |= SP3[(work >> 16) & 0x3fL];   
        fval |= SP1[(work >> 24) & 0x3fL];   
        work  = leftt ^ *keys++;   
        fval |= SP8[ work        & 0x3fL];   
        fval |= SP6[(work >>  8) & 0x3fL];   
        fval |= SP4[(work >> 16) & 0x3fL];   
        fval |= SP2[(work >> 24) & 0x3fL];   
        right ^= fval;   
        }   
   
    right = (right << 31) | (right >> 1);   
    work = (leftt ^ right) & 0xaaaaaaaaL;   
    leftt ^= work;   
    right ^= work;   
    leftt = (leftt << 31) | (leftt >> 1);   
    work = ((leftt >> 8) ^ right) & 0x00ff00ffL;   
    right ^= work;   
    leftt ^= (work << 8);   
    work = ((leftt >> 2) ^ right) & 0x33333333L;   
    right ^= work;   
    leftt ^= (work << 2);   
    work = ((right >> 16) ^ leftt) & 0x0000ffffL;   
    leftt ^= work;   
    right ^= (work << 16);   
    work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;   
    leftt ^= work;   
    right ^= (work << 4);   
    *block++ = right;   
    *block = leftt;   
    return;   
    }   
   
#ifdef D2_DES   
   
void des2key(hexkey, mode)      /* stomps on Kn3 too */   
unsigned char *hexkey;          /* unsigned char[16] */   
short mode;   
{   
    short revmod;   
   
    revmod = (mode == EN0) ? DE1 : EN0;   
    deskey(&hexkey[8], revmod);   
    cpkey(KnR);   
    deskey(hexkey, mode);   
    cpkey(Kn3);                 /* Kn3 = KnL */   
    return;   
    }   
   
void Ddes(from, into)   
unsigned char *from, *into;     /* unsigned char[8] */   
{   
    unsigned long work[2];   
   
    scrunch(from, work);   
    desfunc(work, KnL);   
    desfunc(work, KnR);   
    desfunc(work, Kn3);   
    unscrun(work, into);   
    return;   
    }   
   
void D2des(from, into)   
unsigned char *from;            /* unsigned char[16] */   
unsigned char *into;            /* unsigned char[16] */   
{   
    unsigned long *right, *l1, swap;   
    unsigned long leftt[2], bufR[2];   
   
    right = bufR;   
    l1 = &leftt[1];   
    scrunch(from, leftt);   
    scrunch(&from[8], right);   
    desfunc(leftt, KnL);   
    desfunc(right, KnL);   
    swap = *l1;   
    *l1 = *right;   
    *right = swap;   
    desfunc(leftt, KnR);   
    desfunc(right, KnR);   
    swap = *l1;   
    *l1 = *right;   
    *right = swap;   
    desfunc(leftt, Kn3);   
    desfunc(right, Kn3);   
    unscrun(leftt, into);   
    unscrun(right, &into[8]);   
    return;   
    }   
   
void makekey(aptr, kptr)   
register char *aptr;                /* NULL-terminated  */   
register unsigned char *kptr;       /* unsigned char[8] */   
{   
    register unsigned char *store;   
    register int first, i;   
    unsigned long savek[96];   
   
    cpDkey(savek);   
    des2key(Df_Key, EN0);   
    for( i = 0; i < 8; i++ ) kptr[i] = Df_Key[i];   
    first = 1;   
    while( (*aptr != '\0') || first ) {   
        store = kptr;   
        for( i = 0; i < 8 && (*aptr != '\0'); i++ ) {   
            *store++ ^= *aptr & 0x7f;   
            *aptr++ = '\0';   
            }   
        Ddes(kptr, kptr);   
        first = 0;   
        }   
    useDkey(savek);   
    return;   
    }   
   
void make2key(aptr, kptr)   
register char *aptr;                /* NULL-terminated   */   
register unsigned char *kptr;       /* unsigned char[16] */   
{   
    register unsigned char *store;   
    register int first, i;   
    unsigned long savek[96];   
   
    cpDkey(savek);   
    des2key(Df_Key, EN0);   
    for( i = 0; i < 16; i++ ) kptr[i] = Df_Key[i];   
    first = 1;   
    while( (*aptr != '\0') || first ) {   
        store = kptr;   
        for( i = 0; i < 16 && (*aptr != '\0'); i++ ) {   
            *store++ ^= *aptr & 0x7f;   
            *aptr++ = '\0';   
            }   
        D2des(kptr, kptr);   
        first = 0;   
        }   
    useDkey(savek);   
    return;   
    }   
   
#ifndef D3_DES  /* D2_DES only */   
#ifdef  D2_DES  /* iff D2_DES! */   
   
void cp2key(into)   
register unsigned long *into;   /* unsigned long[64] */   
{   
    register unsigned long *from, *endp;   
   
    cpkey(into);   
    into = &into[32];   
    from = KnR, endp = &KnR[32];   
    while( from < endp ) *into++ = *from++;   
    return;   
    }   
   
void use2key(from)              /* stomps on Kn3 too */   
register unsigned long *from;   /* unsigned long[64] */   
{   
    register unsigned long *to, *endp;   
   
    usekey(from);   
    from = &from[32];   
    to = KnR, endp = &KnR[32];   
    while( to < endp ) *to++ = *from++;   
    cpkey(Kn3);                 /* Kn3 = KnL */   
    return;   
    }   
   
#endif  /* iff D2_DES */   
#else   /* D3_DES too */   
   
static void D3des(unsigned char *, unsigned char *);   
   
void des3key(hexkey, mode)   
unsigned char *hexkey;          /* unsigned char[24] */   
short mode;   
{   
    unsigned char *first, *third;   
    short revmod;   
   
    if( mode == EN0 ) {   
        revmod = DE1;   
        first = hexkey;   
        third = &hexkey[16];   
        }   
    else {   
        revmod = EN0;   
        first = &hexkey[16];   
        third = hexkey;   
        }   
    deskey(&hexkey[8], revmod);   
    cpkey(KnR);   
    deskey(third, mode);   
    cpkey(Kn3);   
    deskey(first, mode);   
    return;   
    }   
   
void cp3key(into)   
register unsigned long *into;   /* unsigned long[96] */   
{   
    register unsigned long *from, *endp;   
   
    cpkey(into);   
    into = &into[32];   
    from = KnR, endp = &KnR[32];   
    while( from < endp ) *into++ = *from++;   
    from = Kn3, endp = &Kn3[32];   
    while( from < endp ) *into++ = *from++;   
    return;   
    }   
   
void use3key(from)   
register unsigned long *from;   /* unsigned long[96] */   
{   
    register unsigned long *to, *endp;   
   
    usekey(from);   
    from = &from[32];   
    to = KnR, endp = &KnR[32];   
    while( to < endp ) *to++ = *from++;   
    to = Kn3, endp = &Kn3[32];   
    while( to < endp ) *to++ = *from++;   
    return;   
    }   
   
static void D3des(from, into)   /* amateur theatrics */   
unsigned char *from;            /* unsigned char[24] */   
unsigned char *into;            /* unsigned char[24] */   
{   
    unsigned long swap, leftt[2], middl[2], right[2];   
   
    scrunch(from, leftt);   
    scrunch(&from[8], middl);   
    scrunch(&from[16], right);   
    desfunc(leftt, KnL);   
    desfunc(middl, KnL);   
    desfunc(right, KnL);   
    swap = leftt[1];   
    leftt[1] = middl[0];   
    middl[0] = swap;   
    swap = middl[1];   
    middl[1] = right[0];   
    right[0] = swap;   
    desfunc(leftt, KnR);   
    desfunc(middl, KnR);   
    desfunc(right, KnR);   
    swap = leftt[1];   
    leftt[1] = middl[0];   
    middl[0] = swap;   
    swap = middl[1];   
    middl[1] = right[0];   
    right[0] = swap;   
    desfunc(leftt, Kn3);   
    desfunc(middl, Kn3);   
    desfunc(right, Kn3);   
    unscrun(leftt, into);   
    unscrun(middl, &into[8]);   
    unscrun(right, &into[16]);   
    return;   
    }   
   
void make3key(aptr, kptr)   
register char *aptr;                /* NULL-terminated   */   
register unsigned char *kptr;       /* unsigned char[24] */   
{   
    register unsigned char *store;   
    register int first, i;   
    unsigned long savek[96];   
   
    cp3key(savek);   
    des3key(Df_Key, EN0);   
    for( i = 0; i < 24; i++ ) kptr[i] = Df_Key[i];   
    first = 1;   
    while( (*aptr != '\0') || first ) {   
        store = kptr;   
        for( i = 0; i < 24 && (*aptr != '\0'); i++ ) {   
            *store++ ^= *aptr & 0x7f;   
            *aptr++ = '\0';   
            }   
        D3des(kptr, kptr);   
        first = 0;   
        }   
    use3key(savek);   
    return;   
    }   
   
#endif  /* D3_DES */   
#endif  /* D2_DES */   
   
/* Validation sets:  
 *  
 * Single-length key, single-length plaintext -  
 * Key    : 0123 4567 89ab cdef  
 * Plain  : 0123 4567 89ab cde7  
 * Cipher : c957 4425 6a5e d31d  
 *  
 * Double-length key, single-length plaintext -  
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210  
 * Plain  : 0123 4567 89ab cde7  
 * Cipher : 7f1d 0a77 826b 8aff  
 *  
 * Double-length key, double-length plaintext -  
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210  
 * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff  
 * Cipher : 27a0 8440 406a df60 278f 47cf 42d6 15d7  
 *  
 * Triple-length key, single-length plaintext -  
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567  
 * Plain  : 0123 4567 89ab cde7  
 * Cipher : de0b 7c06 ae5e 0ed5  
 *  
 * Triple-length key, double-length plaintext -  
 * Key    : 0123 4567 89ab cdef fedc ba98 7654 3210 89ab cdef 0123 4567  
 * Plain  : 0123 4567 89ab cdef 0123 4567 89ab cdff  
 * Cipher : ad0d 1b30 ac17 cf07 0ed1 1c63 81e4 4de5  
 *  
 * d3des V5.0a rwo 9208.07 18:44 Graven Imagery  
 **********************************************************************/   
